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Operating system
OpenBSD is a security-focused, free software, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD
OpenBSD
BSD-based package management
patches provided by the BSD-based operating systems, FreeBSD, NetBSD, and OpenBSD, as a simple method of installing software or creating binary packages
Ports_collection
FSF website for the Ralink and Realtek cards Kerneltrap for the list of OpenBSD drivers The OpenSolaris website for the list of OpenSolaris and Solaris
Comparison of open-source wireless drivers
Comparison_of_open-source_wireless_drivers
Open source web server and a reverse proxy server
deployed technology in Docker containers. In OpenBSD version 5.2 (November 2012), nginx became part of the OpenBSD base system, providing an alternative to
Nginx
options. The three most notable descendants in current use are FreeBSD, OpenBSD, and NetBSD, which are all derived from 386BSD and 4.4BSD-Lite, by various
Comparison of BSD operating systems
Comparison_of_BSD_operating_systems
Security features as used in OpenBSD operating system
The OpenBSD operating system focuses on security and the development of security features. According to author Michael W. Lucas, OpenBSD "is widely regarded
OpenBSD_security_features
TLS extension to serve multiple HTTPS sites
GitHub. Retrieved 4 March 2026. "OpenBSD 6.1 What's New". Retrieved 13 June 2021. "src/lib/libtls/tls.c at master · openbsd/src". GitHub. Retrieved 26 July
Server_Name_Indication
Set of computer programs providing encrypted communication sessions
OpenSSH (also known as OpenBSD Secure Shell) is a suite of secure networking utilities based on the Secure Shell (SSH) protocol, which provides a secure
OpenSSH
Open-source web server software
Retrieved 2013-05-12. "apache-httpd-openbsd-1.3.20140502p2 – OpenBSD improved and secured version of Apache 1.3". OpenBSD ports. Archived from the original
Apache_HTTP_Server
Implementation of TLS protocols
predecessor of TLS, for which support was removed in release 2.3.0. The OpenBSD project forked LibreSSL from OpenSSL 1.0.1g in April 2014 as a response
LibreSSL
Gentoo package management system
an incomplete state. Gentoo/OpenBSD was a Gentoo/*BSD subproject to port Gentoo features such as Portage to the OpenBSD operating system. It was originally
Portage_(software)
Version-control system
view documents see Help:FTP) RCS 4.3 README file. "rcs(1) - OpenBSD manual pages". man.openbsd.org. Retrieved 5 September 2024. F. Tichy, Walter: "RCS: A
Revision_Control_System
Web browser made by Mozilla
available for various Unix and Unix-like operating systems, including FreeBSD, OpenBSD, NetBSD, and other operating systems, such as ReactOS. It is the default
Firefox
Permissive free software license
BIND and dig, it has become the preferred license for contributions to OpenBSD and the default license for npm packages. The ISC license is also used
ISC_license
Terminal multiplexer
can be configured to use compatible keybindings. tmux is included in the OpenBSD base system, and is available as a package for many other Unix-like operating
Tmux
2000s[update], there are four major BSD operating systems–FreeBSD, NetBSD, OpenBSD and DragonFly BSD, and an increasing number of other OSs forked from these
List_of_BSD_operating_systems
Unix operating system
to refer primarily to its open-source descendants, including FreeBSD, OpenBSD, NetBSD, and DragonFly BSD, and derivatives of those projects, such as
Berkeley Software Distribution
Berkeley_Software_Distribution
Suite of system components for Linux
implementations of these APIs for OpenBSD. The original project developer began it in order to ease his transition from Linux to OpenBSD. Project development finished
Systemd
Computer security technique
The first mainstream operating system to support ASLR by default was OpenBSD version 3.4 in 2003, followed by Linux in 2005. Address space randomization
Address space layout randomization
Address_space_layout_randomization
Computer networking utility
rewrites from scratch like GNU netcat or OpenBSD netcat, the latter of which supports IPv6 and TLS. The OpenBSD version has been ported to the FreeBSD base
Netcat
Computer software
doas (“dedicated openbsd application subexecutor”) is a program to execute commands as another user. The system administrator can configure it to give
Doas
Password-based key derivation function
power. The bcrypt function is the default password hash algorithm for OpenBSD,[non-primary source needed] and was the default for some Linux distributions
Bcrypt
Free and open-source VPN protocol
WireGuard in OpenBSD. On 22 June 2020, after the work of Matt Dunwoodie and Jason A. Donenfeld, WireGuard support was imported into OpenBSD. On 23 November
WireGuard
Cryptographic software in OpenBSD
It is part of the OpenBSD Project, having been included in the operating system since OpenBSD 2.8 (December, 2000). Like other OpenBSD projects such as
OpenBSD Cryptographic Framework
OpenBSD_Cryptographic_Framework
Software licensed to be freely used, modified and distributed
nonfree firmware in a kernel whereas OpenBSD uses the term to refer to device drivers. The FSF does not consider OpenBSD to be blob free under the Linux community's
Free_software
File format and file compression program
format. IETF. p. 5. doi:10.17487/RFC1952. RFC 1952. "OpenBSD gzip(1) manual page". Openbsd.org. OpenBSD. Retrieved 4 February 2018. "gzip". Man.freebsd.org
Gzip
Free and open-source Unix-like operating system
PlayStation Vita game consoles. FreeBSD contains a large amount of code from OpenBSD and other current BSD systems. In 1974, Professor Bob Fabry of the University
FreeBSD
Family of Unix-like operating systems
to legal complications, the development of 386BSD, from which NetBSD, OpenBSD and FreeBSD descended, predated that of Linux. Linus Torvalds has stated
Linux
Leader of the OpenBSD project (born 1968)
the OpenBSD and OpenSSH projects and was also a founding member of NetBSD. In 2004, De Raadt won the Free Software Award for his work on OpenBSD and OpenSSH
Theo_de_Raadt
American multinational technology company
OpenBSD. Retrieved December 29, 2014. "iwi(4) – OpenBSD manual pages". OpenBSD. Retrieved December 29, 2014. "wpi(4) – OpenBSD manual pages". OpenBSD
Intel
American software engineer (born 1966)
Retrieved 2019-03-02. "OpenBSD releases Meltdown patch". The Register. 2018-02-23. Retrieved 2019-03-02. Part of the OpenBSD solution used the approach
Matthew_Dillon
64-bit extension of x86 architecture
granularity (segment granularity being used on 32-bit x86). OpenBSD has supported AMD64 since OpenBSD 3.5, released on May 1, 2004. Complete in-tree implementation
X86-64
Permissive free software license
on November 20, 2020. Retrieved November 15, 2006. "Copyright Policy". OpenBSD. Retrieved June 6, 2016. The ISC copyright is functionally equivalent to
MIT_License
Free-software license
GPLv2. The OpenBSD project does not consider the Apache License 2.0 to be an acceptable free license because of its patent provisions. The OpenBSD policy
Apache_License
Standard library for the C programming language
Reference: /OpenBSD/sys/sys/tree.h". bxr.su. "queue". Man.freebsd.org. 13 May 2011. Retrieved 25 August 2013. "Super User's BSD Cross Reference: /OpenBSD/sys/sys/queue
C_standard_library
Software documentation on Unix systems
"WithOut man") allows for browsing man pages from the editor. In 2010, OpenBSD deprecated troff for formatting man pages in favour of mandoc, a specialised
Man_page
Packet filter software
comparable to netfilter (iptables), ipfw, and ipfilter. PF was developed for OpenBSD, but has been ported to many other operating systems. PF was originally
PF_(firewall)
Serverless relational database management system
nix.dev. NixOS. Retrieved 23 April 2026. "ports(7) - OpenBSD manual pages". man.openbsd.org. OpenBSD. Retrieved 23 April 2026. "RPM Database Recovery".
SQLite
Text-based, cross-platform web browser
Classic Mac OS and OS/2. It was included in the default OpenBSD installation from OpenBSD 2.3 (May 1998) to 5.5 (May 2014), being in the main tree prior
Lynx_(web_browser)
Absolute OpenBSD: Unix for the Practical Paranoid is a comprehensive guide to the OpenBSD operating system by Michael W. Lucas, author of Absolute FreeBSD
Absolute_OpenBSD
The OpenBSD Journal is an online newspaper dedicated to coverage of OpenBSD software and related events. The OpenBSD Journal is widely recognized as a
OpenBSD_Journal
Technical specification for firmware architecture
com. Retrieved 12 April 2026. "OpenBSD 5.9". www.openbsd.org. Retrieved 11 September 2016. "OpenBSD 6.0". www.openbsd.org. Retrieved 11 September 2016
UEFI
Networking protocol for clock synchronization
original on 2 May 2021. Retrieved 24 July 2021. "ntpd(8) - OpenBSD manual pages". man.openbsd.org. It implements the Simple Network Time Protocol version
Network_Time_Protocol
Software build automation tool
and survives with varying degrees of modification in FreeBSD, NetBSD and OpenBSD. Distinctively, it has conditionals and iterative loops which are applied
Make_(software)
"Supported Platforms". Freebsd.org. Retrieved 26 October 2011. "OpenBSD: Platforms". OpenBSD. 9 May 2006. Retrieved 21 October 2019. "Platforms Supported
Comparison of open-source operating systems
Comparison_of_open-source_operating_systems
Environment in which a piece of software is executed
and Unix-like BSD SunOS NeXTSTEP Darwin macOS OpenDarwin 386BSD NetBSD OpenBSD FreeBSD DragonFly BSD System V HP-UX IBM AIX A/UX Solaris OpenSolaris illumos
Computing_platform
Topics referred to by the same term
lighting corporation, formerly known as Philips Lighting N.V. signify (OpenBSD), OpenBSD utility Sign (disambiguation) This disambiguation page lists articles
Signify
Computer software bug occurring in 2038
but such older applications will still suffer from the Y2038 problem. OpenBSD since version 5.5, released in May 2014, also uses a 64-bit time_t for
Year_2038_problem
selection of notable clients. Based on Trilead SSH-2 for Java. Also known as OpenBSD Secure Shell. Based on OSSH. Based on Tera Term Pro 2.3 (1994–1998). Based
Comparison_of_SSH_clients
Cryptographic network protocol
software stack is OpenSSH, released in 1999 as open-source software by the OpenBSD developers. Implementations are distributed for all types of operating
Secure_Shell
Software for defining and provisioning datacenter infrastructure
ago (24 June 2026) Written in Go Operating system Linux, FreeBSD, macOS, OpenBSD, Solaris, and Microsoft Windows Available in English Type Infrastructure
Terraform_(software)
Network Time Protocol implementation
OpenNTPD (also known as OpenBSD NTP Daemon) is a Unix daemon implementing the Network Time Protocol to synchronize the local clock of a computer system
OpenNTPD
ppp(4) - OpenBSD manual pages. OpenBSD Project pppoe(4) - OpenBSD manual pages. OpenBSD Project vlan(4) - OpenBSD manual pages. OpenBSD Project OpenBSD 5.8
Comparison of operating system kernels
Comparison_of_operating_system_kernels
Extension of a private network across a public one
original on 8 October 2022. Retrieved 8 October 2022. "ssh(1) – OpenBSD manual pages". man.openbsd.org. Archived from the original on 5 July 2022. Retrieved
Virtual_private_network
Computer firmware interface standard
ArcaOS, FreeBSD (since FreeBSD 5.0), NetBSD (since NetBSD 1.6), OpenBSD (since OpenBSD 3.8), HP-UX, OpenVMS, Linux, GNU/Hurd and PC versions of Solaris
ACPI
Concurrent IPv4 and IPv6 algorithm
back to IPv4 for dual-stack hosts), OS X Lion, iOS 5, cURL 7.34.0 and OpenBSD. Happy Eyeballs (pre-version 1) testing was part of World IPv6 Day in 2011
Happy_Eyeballs
Data storage technology
2009-08-28. Retrieved 2010-08-24. "3.8: "Hackers of the Lost RAID"". OpenBSD Release Songs. OpenBSD. 2005-11-01. Retrieved 2019-03-23. Long, Scott; Adaptec, Inc
RAID
Command on Unix systems to temporarily assume root privileges
Services. doas, available since OpenBSD 5.8 (October 2015), has been written in order to replace sudo in the OpenBSD base system, with the latter still
Sudo
written in Modula-3 Windows NT 3.5 1995 Digital UNIX (aka Tru64 UNIX) OpenBSD OS/390 Plan 9 Second Edition (Commercial second release version was made
Timeline_of_operating_systems
Short-range wireless technology standard
since its v4.0 release. Its Bluetooth stack was ported to OpenBSD as well, however OpenBSD later removed it as unmaintained. DragonFly BSD has had NetBSD's
Bluetooth
Mail sent using electronic means
mailing list, your message should be sent as "plain text." "OpenBSD Mailing Lists". OpenBSD. Archived from the original on February 8, 2014. Retrieved
and is erroneously documented in 1.2.11 as a behaviour activated by the OpenBSD rm-compatible option -P. However, in both the OS X and SourceForge srm
Srm_(Unix)
Type of user account in Unix systems
File 4.4.7. Eric S. Raymond. Retrieved 2008-09-12. "su(1) - OpenBSD manual pages". man.openbsd.org. Retrieved 2018-05-05. "su". www.freebsd.org. Retrieved
Wheel_(computing)
Supported Boards NetBSD/mvmeppc "OpenBSD/mvme68k Port". www.openbsd.org. Retrieved 2024-01-13. "OpenBSD/mvme88k". www.openbsd.org. Retrieved 2024-01-13. "m88k
Motorola Single Board Computers
Motorola_Single_Board_Computers
File synchronization protocol and software
been ported to Windows (via Cygwin, Grsync, or SFU), FreeBSD, NetBSD, OpenBSD, and macOS. A command line to mirror FreeBSD might look like: $ rsync -avz
Rsync
Domain Name System software
written for POSIX-compatible Unix-like operating system, it runs on FreeBSD, OpenBSD, NetBSD, macOS, and Linux, as well as Microsoft Windows. Unbound has supplanted
Unbound_(DNS_server)
Free and open-source virtual private network software
IP traffic, have a different format. It is available on Solaris, Linux, OpenBSD, FreeBSD, NetBSD, QNX, macOS and Windows XP and later. OpenVPN is available
OpenVPN
Family of text editors
intended to more closely resemble GNU Emacs. Now installed by default on OpenBSD and macOS. JOVE (Jonathan's Own Version of Emacs), Jonathan Payne's non-programmable
Emacs
Distributed version control software system
operating systems, including the BSDs (DragonFly BSD, FreeBSD, NetBSD, and OpenBSD), Solaris, macOS, and Windows. The first Windows port of Git was primarily
Git
Software published only in binary code
via standard utilities (like ifconfig) out of the box; Theo de Raadt of OpenBSD attributes this to the work done by a single FreeBSD developer. Some FSF-approved
Binary_blob
Computer security utility
application. Systrace used to be integrated into OpenBSD, but was removed in April 2016 (in favour of pledge post OpenBSD 5.9). It is available for Linux and Mac
Systrace
2014 re-implementation of a 2002 video game
2026) Written in C, C++ Operating system Microsoft Windows, Linux, macOS, OpenBSD, Android Platform x86, x64, ARM Available in 20 languages Type Construction
OpenRCT2
Family of computer operating systems
Unix has been developed in several different product branches, including OpenBSD and DragonFly BSD. Because of the modular design of the Unix model, sharing
Unix
Operating system that behaves similarly to Unix
well-known examples of Unix-like operating systems include Linux, FreeBSD and OpenBSD. These systems are often used on servers as well as on personal computers
Unix-like
File system used by many Unix and Unix-like operating systems
Retrieved 2022-09-27. "OpenBSD 2.9 Release". OpenBSD. 2001-06-01. Retrieved 2013-04-08. "Soft updates disabled for future VFS work". OpenBSD Journal. 2023-07-05
Unix_File_System
Way to traverse IP address spaces without routing
iptables/nftables: the Linux packet filter NPF: NetBSD-native packet filter PF: OpenBSD-native packet filter Routing and Remote Access Service (RRAS): routing
Network_address_translation
Protocol to run DNS queries using TLS
over TLS in Unbound". Ctrl blog. Retrieved 2018-08-07. "openbsd-cvs mailing list archives". "openbsd-cvs mailing list archives". "DNS over TLS support in
DNS_over_TLS
Command-line interpreter for operating systems
distributions. A clone of ksh88 known as pdksh is the default shell in OpenBSD. Jörg Schilling's Schily-Tools includes three Bourne Shell derivatives
Bourne_shell
Desktop publishing application
4/eComStation (up to 1.5.0) ArcaOS FreeBSD (up to 1.5.0), PC-BSD (up to 1.5.0), OpenBSD (up to 1.5.0), NetBSD (up to 1.5.0) Solaris (up to 1.4.8) OpenIndiana (up
Scribus
Computing concept
systems, network interrupts can be used as an entropy source as well. OpenBSD has integrated cryptography as one of its main goals and has always worked
Entropy_(computing)
secureblue". secureblue.dev. Retrieved 31 March 2026. OpenBSD Project (19 May 2020). "OpenBSD". OpenBSD.org. Retrieved 12 October 2020. "Qubes OS bakes in
List of security-focused operating systems
List_of_security-focused_operating_systems
Software interface for Unix-like systems
to the actual kernel interfaces. FUSE is available for Linux, FreeBSD, OpenBSD, NetBSD (as puffs), OpenSolaris, Minix 3, macOS, MorphOS (as filesysbox
Filesystem_in_Userspace
One-time password software applications
Command-line tool for generating OTP tokens. No No No Yes No No FreeBSD, NetBSD, OpenBSD Unknown Yes Yes Yes Yes Unknown Open Authenticator Free, open-source and
Comparison of OTP applications
Comparison_of_OTP_applications
Security-focused, Android-based mobile operating system
Monolithic (Linux/Android kernel) Influenced DivestOS, secureblue Influenced by OpenBSD, PaX License MIT, Apache License, various permissive open-source licenses
GrapheneOS
Concept in computer security
emulation to offer these features on those architectures. A technology in the OpenBSD operating system, known as W^X, marks writable pages by default as non-executable
Executable-space_protection
Free and open-source productivity software suite
Collabora or by community members, as is the case for BSD (FreeBSD, NetBSD, OpenBSD) and OpenIndiana. Earlier versions of LibreOffice and its predecessors
LibreOffice
Implementation of SSL and TLS protocols
sane interface". OpenBSD ports. May 22, 2014. Archived from the original on February 10, 2015. Retrieved February 10, 2015. "OpenBSD has started a massive
OpenSSL
Line of netbooks by Acer Inc.
hibernate, and power management which worked to a very limited degree. OpenBSD releases ranging from 4.4 to 6.4 were known to run on some of the many
Acer_Aspire_One
Notable software packages that are nominal IDE
Yes Yes Yes Yes Yes Yes IntelliJ IDEA Proprietary Yes Yes Yes FreeBSD, OpenBSD, Solaris Yes No Yes Yes Yes Yes Powerflasher FDT Proprietary Yes Yes Yes
Comparison of integrated development environments
Comparison_of_integrated_development_environments
Programming language
April 7, 2022. Retrieved March 13, 2016 – via Twitter. "lang/go: go-1.4". OpenBSD ports. December 23, 2014. Retrieved January 19, 2015. "Go Porting Efforts"
Go_(programming_language)
Hacker group
vulnerability OpenBSD 2.x - Pending ARP Request Remote Denial of Service in OpenBSD followed by a series of remote exploits against OpenBSD (some co-authored
TESO_(Austrian_hacker_group)
Cryptographic protocols for securing data in transit
provider implementation (named SunJSSE) LibreSSL: a fork of OpenSSL by OpenBSD project. MatrixSSL: a dual licensed implementation Mbed TLS (previously
Transport_Layer_Security
System call for device-specific input/output operations
discover drive-geometry information of the attached storage-devices. On OpenBSD and NetBSD, ioctl is used by the bio(4) pseudo-device driver and the bioctl
Ioctl
Operating system memory security feature
those used in as components in larger operating systems like FreeBSD, OpenBSD, Solaris, and the UNIX System Services of Z/OS, W^X is controlled via the
W^X
Family of IEEE standards for compatibility between operating systems
distributions) LynxOS Minix (since 2005 Minix 3) MPE/iX NetBSD Nucleus RTOS NuttX OpenBSD OpenSolaris PikeOS RTOS for embedded systems with optional PSE51 and PSE52
POSIX
Network administration command-line tool
Computer Systems Research Group) Operating system Linux, NetBSD, FreeBSD, OpenBSD, macOS, Windows, Solaris, illumos, OpenVMS Type DNS lookup tool License
Dig_(command)
Stacking window manager
"xenocara/app/cwm/calmwm.c", OpenBSD CVS, OpenBSD, 27 April 2007, retrieved 30 April 2017 OpenBSD CVS log, The OpenBSD CVS, retrieved 16 November 2011{{citation}}:
Cwm_(window_manager)
Type of resource record in the Domain Name System
"ssh-keygen(1) - OpenBSD manual pages". man.openbsd.org. Retrieved 2025-05-30. "ssh-keyscan(1) - OpenBSD manual pages". man.openbsd.org. Retrieved 2025-05-30
SSHFP_record
Series of computer workstations and servers
also have current support in NetBSD and Linux. It used to be supported by OpenBSD, but the port was discontinued after the 2.9 release. Models are listed
Sun-3
Elliptic curve used in Internet cryptography
Messenger Gajim via plugin GNUnet GnuPG Google Allo I2P IPFS iOS Monero OpenBSD and signify OpenSSH Peerio Proton Mail PuTTY Signal Silent Phone SmartFTP
Curve25519
OPENBSD
OPENBSD
OPENBSD
OPENBSD
Boy/Male
Indian
Voice
Female
English
English name derived from the gem name, from Greek krystallos, CRYSTAL means "ice."
Girl/Female
Hindu
Earth
Surname or Lastname
English (Kent)
English (Kent) : unexplained.
Biblical
my good God; the goodness of the foundation of the Lord
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : probably from a reduced form of the Anglo-Norman French personal name or nickname Avenant ‘suitable’ or ‘handsome’.Family historians record an Isham Avent in the Carolinas in the 1760s. His father was Colonel Thomas Avent from England.
Boy/Male
Muslim/Islamic
Religion
Boy/Male
American, Australian, Chinese, Dutch, Finnish, French, German, Greek, Irish, Polish, Portuguese, Swedish
Brave; Masculine; Manly; Beautiful and Dared
Girl/Female
Hindu
Goddess Parvati (Wife of Lord Shiva)
Boy/Male
English
Derived from a British place name.
OPENBSD
OPENBSD
OPENBSD
OPENBSD
OPENBSD